If anyone is a die hard user of Nessus like I am, don't install this release just yet. It will only run in detached mode right now. I have opened a bug on the Nessus site so maybe 1.3.4 will address this issue.

PLATFORM & VERSION
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RH Linux with Nessus 1.3.3

ISSUE
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When you launch NessusWX (the Windows console for the scanner) and attempt a scan, the program terminates unexpectedly.

WORK AROUND
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Run the scan in detached mode and have the results e-mailed to you.

ADDITIONAL INFO
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On a positive note, this version scans a hell of a lot faster than previous versions. Also, debugging NASLs is most improved. It will even give you line numbers in the NASL when there is a failure of some sort.

Anyway, hope this helps!